Subject Index SummariesFungi (In Association with Herbaceous Plants): Increases in the air's CO2 content tend to enhance fungal colonization of the roots of many herbaceous species, stimulating the development of intricate mycelial networks that perform a host of beneficial activities for the plants.

Thermohaline Circulation: Powerful globe-circling surface and undersea ocean currents have been suggested to be responsible for hemispheric and global temperature excursions that seem to come and go on a regular millennial-scale basis. Does CO2 play a regulatory role in this long-running planetary drama? Or is it just along for the ride?

Two Centuries of Temperature Change in Rural Norway: Where urban influences are absent, much of the earth seems to have reached a temperature maximum sometime in the 1930s (above which it has not subsequently risen) in the course of the planet's recovery from the global chill of the Little Ice Age.

Cloud Cover Over the Indian Ocean: The author of this study says climate model calculations suggest that cloud cover over the northern Indian Ocean should have "significantly decreased over the past several decades." Real-world data, however, tell a radically different story, as earth's climate system flexes its negative feedback muscles.